package _03静态变量的应用_在线人数统计;

public class UserDemo {
    public static void main(String[] args) {
        User u1 = new User("admin","123456");
        u1.login();

        User u2 = new User("admin","123456");
        u1.login();

        User u3 = new User("admin","123456");
        u1.login();
    }
}
